Philippine Volcanoes are classified as Active, Inactive and Potentially active.

  Active Volcanoes

- Eruption in historic times
- Historical record - 500 years
- C14 dating - 10,000 years
- Local seismic activity
- Oral / folkloric history

  Potentially Active

- Solfataras / Fumaroles
- Geologically young (possibly erupted < 10,000 years and for calderas and large systems - possibly < 25,000 years).
- Young-looking geomorphology (thin soil cover/sparse vegetation; low degree of erosion and dissection; young vent featuresl; +/- vegetation cover).
- Suspected seismic activity.
- Documented local ground deformation
- Geochemical indicators of magmatic involvement.
- Geophysical proof of magma bodies.
- Strong connection with subduction zones and external tectonic settings.

  Inactive

          No record of eruption and its form is beginning to change by the agents of weathering and    
          erosion via formation of deep and long gullies.